"We are extremely grateful to viewers in south east London for their help with these important tests."

If you live in the south east London area and notice problems with your Freeview service call 0333 31 31 800.

You will be asked for your postcode, the type of interference and the time it occurred. This will allow at800 to restore your service as soon as possible.

If you have not been contacted directly through the post, any interference to your Freeview service is unlikely to be due to the 4G test. TVs connected to a cable or satellite service are not affected.